Pumps



K. R. LUNG 2,853,013

PUMPS 2 Sheets-Shee t 1 Sept. 23, 1958 Filed Dec. 24, 1954 KENNETH R. LUNG BY ATTORNEYS I [WW6 Sept- 1958 K. R. LUNG 2,853,013

PUMPS Filed Dec. 24, 1954 2 Sheets-Sheet 2 3 FIG-3 9 35 FIG-4 3o 90 4O +69 I N VEN TOR.

KENNETH R. LUNG .6 ATTORN EYS 2,853,013 Patented. Sept, 23', 195-8 huh PUMPS Kenneth R. Lung, Dayton, Ghio, assignor to The 'l:ait Manufacturing Company, Dayton, Ohio, a corporation of Ohio Application-December 24, 1954, SeriallNo. 477,442

4 Claims. (CL 103-5) This invention relates to centrifugal pumps,- and particularly to a multi-stage centrifugal pump embodying a plurality of impellers.

It is a" primary object of the invention to provide a multi-st'age pump which is of novel and simpleconstruction embodying component parts of such structural characteristics that the pump as a whole is of notably compact proportions promoting fabrication at economical cost while at the same time having highly efficient operating characteristics.

Another object of the invention is to provide a multistage centrifugal pump which requires only a single housing for each impeller, and particularly to provide a twostage centrifugal pump wherein the housing for the firststage impeller also includes an inlet for this impeller and the main discharge chamber for the pump as a whole, and wherein this housing and the housing for the second s-tage impeller embody mating passageways forconducting the discharge of the first-stage impeller to the seconds'tage impeller and for returning the discharge ofthe second-stage impeller directly to the main discharge chamber in the first stage housing.

An additional object of the invention is to provide a multistage centrifugal pump as outlined above having longitudinal axially aligned and angularly offset passageways through the component housings thereof to facilitate the flow of' liquid in opposite directions through the pump at different stages of the pumping operations thereon with a minimum of outside connections and the like.

It is also an object of the invention to provide a multistage centrifugal pump including a plurality of impellers which is especially adapted for ready combination with a jet pump, and particularly to provide a combined multistage centrifugal pump and jet pump unit wherein the connections between the centrifugal and the jet portions of the unit are located on the front of the same housing which also contains the first stage centrifugal impeller and the main discharge chamber for the pump as a whole.

A further object of the invention is to provide a novel and simple impeller construction for a multi-stage centrifugal pump, and particularly to provide a centrifugal impeller which incorporates an integral sleeve on one side thereof for mounting on a drive shaft and also an integral stub shaft on the opposite side thereof from the sleeve for supporting and driving a second impeller, and which requires a minimum of rotary seals for efficient operation;

Other objects and advantages of the invention will be apparent from the following description, and accompanying drawing and the appended claims.

In the drawing- Fig. 1 is a somewhat diagrammatic sectional view illustrating a combined multi-stage centrifugal pump and jet pump constructed in accordance with the present invention;

Fig. 2 is an enlarged fragment of Fig. 1 illustrating in detail the structure of and connection between the twostage centrifugal impellers in the pump of Fig. 1;

Fig; 3 is a detailiview of the main housing ofthe pump of Fig. l, the view being partly in elevationfland partly broken away approximately on the line 3--3 of Fig. 4 to illustrate details of internal construction;

Fig. 4 is a sectional view taken on the line 4--4 of Fig. 3;

Fig. 5 is a sectional view of the second-stage impeller housing in the pump of Fig. l, the view being partly in elevation and partly broken away in section, theinpp er left hand portionlbeing approximately on the line 5a--5a of Fig. 6 and the lower left hand portion being approximately on the line 5b--5b of'Fig; 6; and

Fig. 6 is a sectional view taken on the line 6--6= of Fig. 5.

Referring to the drawings", which illustrate a preferred embodiment of' the invention,- the electric drive motor10 is bolted to a bracket 11 which is shown as of'essentially the same construction disclosed'in my copending application Serial No. 373,564, filed August 11, 1953, now Patent No. 2,810,346, and assigned to the same assignee as this application. The motor drive shaft 12 projects through a bore in the opposite side of the bracket 11 from motor 10, and this shaft 12 drives a pair of centrifugal impellers 13 and 15.

As shown in. detail in Fig. 2, the impeller 13 includes an integral sleeve 16 extending rearwardly thereof and fitting over the shaft 12, and a collar 17 isin turn received over the sleeve 16 and carries a set screw 18 engaging in a slot or' keyway 19' in the shaft 12 tolock impeller 13 in axial and angularl'y fixed. position with respect to the motor shaft. The impeller 13 also includes an integral stub shaft 20 projecting forwardly therefrom coaxially with the sleeve 16, and the hub portion 21 of impeller 15 is received over this stub shaft and is locked thereto by a bolt 22 and lock washer 23. This simple structural arrangement has the further advantage that it requires only a single rotary seal indicated generally at 25 at the junction between the sleeve 16 and the bracket 11 and including a metal cup 26 fitted in the bore 27 in bracket 11 through which sleeve 16 projects.

The impellers 13 and 15 are housed in a main pump housing 30 and a second-stage housing 31 which are secured together and to the bracket 11 by means of cap screws 32 extending from the bracket through bores 33 in housing 31 into tapped bores 35 in the main housing 30. The housing 30 encloses the main discharge chamber 40 of the pump, and a partition wall 41 therein defines a first-stage pumping chamber 42 at the rear of housing 30 which receives the first-stage impeller 15. The inlet passage 44 to pumping chamber 42 leads centrally through chamber 40 from an inlet port 45 at the front of housing 30. The back of pumping chamber 42 is closed bythe front wall 46 of the housing 31 and a suitable gasket47.

The discharge from the first-stageimpeller 15 is conducted generally tangentially outwardly from the pumping chamber 42 by a plurality of volute diffuser passageways 50 which are formed by rib-like portions 51 of the housing 38 and each of which leads to a. port 52 in the rear face of housing 30. Each of these ports 52 mates with a similar port 53 and passageway 54 in the adjacent front face of the housing 31, and each passageway 54 in turn connects as shown in Figs. 1 and 5 with an inlet chamber 55 in the front portion of the housing 31. A plurality of reinforcing ribs 56 are located in the inlet chamber 55 between the front wall 46 of housing 31 and a partition wall 57 which defines a second-stage pumping chamber in the rear of housing 31 connected with the inlet chamber 55 by a central base 58. The back of the pumping chamber 60 is in turn closed by the bracket 11 and a suitable gasket 61.

The inlet portion of the second-stage impeller 13 is supported in the bore 58 by a bearing 62, and an additional bearing 63 supports the hub 21 of the first-stage impeller in the inlet passageway 44. The impeller 13 thus receives liquid directly from the inlet chamber 55, and its discharge is conducted generally tangentially outwardly from pumping chamber 60 by volute diffuser passageways 65 formed by rib portions 66 of housing 31 and each also extending forwardly in the outer portion of housing 31 to a port 67 in the front face of housing 31.

As shown in Fig. 5, the housing 31 is constructed with these ports 67 and the ports 53 in alternating relation. The housing is similarly provided with ports 68 adapted to mate with the ports 67, and these ports 68 open into passageways 69 leading directly into the main discharge chamber 40. The ports 68 and passageways 69 alternate with the ports 52 in the housing 30 so that when the housings are arranged with their respective passageways 5t and 65 in staggered relation, the proper sets of ports will mate with each other in such manner that the discharge from the first-stage impeller 15 will be conducted fro-m the pumping chamber 42 to the inlet chamber for the second-stage impeller 13, and the discharge from this impeller will be conducted from the pumping chamber directly to the main discharge chamber 40.

Fig. 1 illustrates this two-stage centrifugal pump as combined with a jet pump which comprises a housing within which are the jet nozzle 76 and cooperating venturi tube 77, and the suction line 78 leads to housing 75 from the well or other source of liquid to be pumped. The connection between the jet pump housing 75 and the centrifugal unit is provided by a pair of conduits 80 and 81 which are indicated as flexible pipes connected at each end to one of the housings 30 and 75 by means of a seal member 82 and cooperating gland 83 bolted to the adjacent housings, these parts being indicated as of essentially the same construction disclosed in my copending application Serial No. 437,515, filed June 17, 1954, now Patent No. 2,786,417, and assigned to the same assignee as this application. The conduits 8t) and 81 may be of different lengths depending upon the depth of the well as described in said application Serial No. 437,515.

The pipe 80 is the low pressure line from the jet pump to the first-stage impeller 15, and it connects with the inlet port 45. The high pressure line 81 connects to a port 85 located in a convenient position on the front of housing 30, shown as just below the port 45. The other end of the high pressure line 81 connects with the passage 86 in jet housing 75 which leads to the inlet end of the jet nozzle 76. Fig. 4 also indicates a passage 81, which is normally plugged, for connecting to the usual automatic air volume control.

With this arrangement as shown, the pressure developed in the main discharge chamber 40 is supplied to the jet nozzle 76 to develop suction in the main suction line 78, and the discharge from the jet pump venturi 77 is supplied directly to the inlet passage 44 to the first-stage impeller 15. From the first-stage impeller chamber 42, the liquid is conducted to the second-stage impeller 13 and then back to the discharge chamber 4ft from which it is finally discharged through the main discharge line 90. This discharge line 90 communicates with the discharge chamber 40 through a port 91 in a partition wall 92 within housing 30, and this port 91 is adapted to be variably restricted by an adjustable needle valve 95 which acts to maintain a desired pressure within chamber 40 and a. desired volumetric rate of discharge flow from the pump as a whole, this arrangement being essentially as described in my copending application Serial No. 359,539, filed June 4, 1953, now abandoned, and assigned to the same assignee as this application. it will be apparent that if it is desired to utilize the centrifugal pump unit without the jet pump, this may readily be done by plugging the port 85 and utilizing the line 80 as the main suction line for the pump.

It will accordingly be seen that this invention provides a multi-stage centrifugal pump unit having a minimum tit) of component parts and which is easily fabricated and assembled at economical cost. For example, only two pump casings are required to provide all the necessary chambers and connecting passages in combination with a single mounting bracket for both the pump section and the motor. The double impeller unit is similarly of simple construction facilitating both initial fabrication and also assembly and effective sealing. From all these standpoints, the invention offers outstanding practical advantages for maintenance purposes as well as fabrication and initial installation.

While the form of apparatus herein described constitutes a preferred embodiment of the invention, it is to be understood that the invention is not limited to this precise form of apparatus, and that changes may be made therein without departing from the scope of the invention which is defined in the appended claims.

What is claimed is:

1. A two-stage pump of the character described comprising a main housing having a discharge chamber in the front thereof, means including a partition in said main housing defining a first stage pumping chamber behind said discharge chamber and an inlet to said pumping chamber, a second housing behind said main housing, means including walls in said second housing defining a second stage pumping chamber and an inlet chamber connected therewith and located between said pumping chambers, first and second stage, impellers operating in respective said pumping chamber s, a plurality of angularly spaced first and second stage diffuser passageways leading outwardly in said housings from said pumping chambers respectively and in generally radial alignment with the associated said pumping chamber, means securing said housings together with said diffuser passageways in angularly staggered relation in respective said housings, first stage connecting passageways in said housings leading rearwardly from said first stage diffuser passageways to said inlet chamber, second stage connecting passageways in said housings closed at the back ends thereof and extending axially forwardly to said discharge chamber in angularly alternating relation with said first stage connecting passageways directly from the outer ends of said second stage diffuser passageways to conduct the discharge from said second stage impeller directly to said discharge chamber without preliminary mixing thereof, and a main discharge line leading from said discharge chamber.

2. A two-stage pump of the character described comprising a main housing having a discharge chamber in the front thereof, a second housing behind said main housing, means including a partition in said main housing and an inner portion of the front wall of said second housing defining a first stage pumpin chamber behind said discharge chamber and an inlet to said pumping chamber, a sup orting bracket secured to the back of said second housing, means including a wall portion of said bracket and a partition in said second housing defining a second stage pumping chamber, said front wall portion of said second housing and said partition therein defining an inlet chamber located between said pumping chambers and connected with said second stage pumping chamber, first and second stage impellers operating in respective said pumping chambers, a plurality of angularly spaced first and second stage diffuser passageways leading outwardly in said housings from said pumping chambers respectively and in generally radial alignment with the associated said pumping chamber, means securing said housings together with said diffuser passageways in angular staggered relation in respective said housings, first stage connecting passageways in said housings leading rearwardly from said first stage diffuser passageways to said inlet chamber, said second housing having an imperforate annular back wall located radially beyond said second stage pumping chamber, second stage connecting passageways in said housings extending axially forwardly from said imperforate wall of said second housing to said discharge chamber in angularly alternating relation with said first stage connecting passageways directly from the outer ends of said second stage diffuser passageways to conduct the discharge from said second stage impeller directly to said discharge chamher without preliminary mixing thereof, and a main discharge line leading from said discharge chamber.

3. A two-stage pump of the character described comprising a main housing having a discharge chamber in the front thereof, means including a partition in said main housing defining a first stage pumping chamber behind said discharge chamber and an inlet to said pumping chamber, a second housing behind said main housing, means including walls in said second housing defining a second stage pumping chamber and an inlet chamber connected therewith and located between said pumping chambers, first and second stage impellers operating in respective said pumping chambers, a plurality of angularly spaced first and second stage diffuser passageways leading outwardly in said housings from said pumping chambers respectively and in generally radial alignment with the associated said pumping chamber, means securing said housings together with said diffuser passageways in angularly staggered relation in respective said housings, said main housing having in the back wall thereof a plurality of ports each leading directly rearwardly from the outer end of one of said first stage diffuser passageways, said second housing having in the front wall thereof a plurality of first stage ports mating with said ports in said main housing and leading to said inlet chamber, said second housing also having in said front wall a plurality of second stage ports each leading directly forwardly from the outer end of one of said second stage diffuser passageways, said main housing having a plurality of passages leading directly from said second stage ports in said second housing between said ports in said main housing to said discharge chamber to conduct the discharge from said second stage impeller directly to said discharge chamber without preliminary mixing thereof, and a main discharge line leading from said discharge chamber.

4. A two-stage pump of the character described comprising a main housing having a discharge chamber in the front thereof, a second housing behind said main housing, means including a partition in said main housing and an inner portion of the front wall of said second housing defining a first stage pumping chamber behind said discharge chamber and an inlet to said pumping chamber, a supporting bracket secured to the back of said second housing, means including a wall portion of said bracket and a partition in said second housing defining a second stage pumping chamber, said front wall portion of said second housing and said partition therein defining an inlet chamber located between said pumping chambers and connected with said second stage pumping chamber, first and second stage impellers operating in respective said pumping chambers, a plurality of angularly spaced first and second stage diffuser passageways leading outwardly in said housings from said pumping chambers respectively and in generally radial alignment with the associated said pumping chamber, means securing said housings together with said diffuser passageways in angular staggered relation in respective said housings, said main housing having an annular back wall provided with ports therein each leading directly from the outer end of one of said first stage diffuser passageways, said second housing having an annular front wall portion mating with said back wall portion of said first housing and having also an imperforate annular back wall axially aligned with said front wall portion thereof, said second housing having in said front wall portion thereof a plurality of first stage ports mating with said ports in said main housing and leading to said inlet chamber, said second housing also having in said front wall portion a plurality of second stage ports each leading directly forwardly from the outer end of one of said second stage diffuser passageways, said main housing having in said rear wall portion thereof a plurality of passageways matching said second stage ports in said second housing wall and leading directly therefrom between said ports and said main housing to said discharge chamber to conduct the discharge from said second stage impeller directly to said discharge chamber without preliminary mixing thereof, and a main discharge line leading from said discharge chamber.

References Cited in the file of this patent UNITED STATES PATENTS ri f I UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION A Patent No, 2,853,013 September 23, 1958 Kenneth Ba Lung printed specification It is hereby certified that error appears in the that the said Letters of the above numbered patent requiring correction and Patent should read as corrected below.

for "and accompanying" read m the accompany:

Column 1, lines 63 and 6A "axial" read w axially column A, line ing column 2, line 30, for 28, after "stage" strike out the comma,

Signed and sealed this 23rd day of December 1958.,

.(SEAL) Attest: I

ROBERT C. WATSON KARL H;- AXLINE Attesting' Oificer Commissioner of Patents 

